Coassembly of Linear Diblock Copolymer Chains and
Homopolymer Brushes on Silica Particles: A Combined Computer Simulation
and Experimental Study
Version 2 2018-02-22, 20:10
Version 1 2018-02-22, 20:04
Posted on 2018-02-22 - 20:10
A combined
computer simulation and experimental study on coassembly of poly(2-(dimethylamino)ethyl
methacrylate)-block-polystyrene (PDMAEMA-b-PS) block copolymers and PS brushes on silica particles
was performed. PS brushes on silica particles at two different grafting
densities were prepared by the “grafting to” approach,
and PDMAEMA-b-PS block copolymers with different
molecular weights and compositions were synthesized by reversible
addition–fragmentation chain transfer polymerization. In THF/methanol
mixtures, block copolymer chains and PS brushes coassemble into surface
micelles (s-micelles), with collapsed PS cores and PDMAEMA coronae.
Meanwhile, block copolymer chains are able to self-assemble into block
copolymer micelles (b-micelles). Computer simulation results and experimental
results indicate that block copolymer concentration, PS and PDMAEMA
block lengths, and PS grafting density exert significant influences
on the coassembly process. In low BCP concentration regime, the average
size of s-micelles increases with BCP concentration and keeps unchanged
at high concentration. The PS block length has a significant influence
on the size of s-micelles. The average size increases with an increase
in PS block length. For a BCP with long solvophilic PDMAEMA block,
it is energy favorable to self-assemble into b-micelles, but to coassemble
into s-micelles. With an increase in PDMAEMA block length, the morphology
of the s-micelles changes from wormlike/spherical structures to spherical
structures and to smaller spherical structures. The average size of
the s-micelles coassembled by PS brushes at a lower grafting density
is smaller than those coassembled by PS brushes at a higher grafting
density.
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Hou, Wangmeng; Feng, Yuan; Li, Baohui; Zhao, Hanying (2018). Coassembly of Linear Diblock Copolymer Chains and
Homopolymer Brushes on Silica Particles: A Combined Computer Simulation
and Experimental Study. ACS Publications. Collection. https://doi.org/10.1021/acs.macromol.7b02461
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AUTHORS (4)
WH
Wangmeng Hou
YF
Yuan Feng
BL
Baohui Li
HZ
Hanying Zhao
KEYWORDS
THFblock copolymer chainssolvophilic PDMAEMA blockPS block copolymerssilica particlesblock copolymer concentrationLinear Diblock Copolymer ChainsBCP concentration regimes-micellePS block lengthPDMAEMA block lengthPDMAEMA block lengthsPS brushesComputer simulation resultsPS brushes coassembleblock copolymer micelles